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New technologies providing tight focusing lens and mirrors with largenumerical apertures and electro-optic modulation of single photons are nowavailable for the investigation of photon-atom interactions without a cavity.From the theoretical side, new models must be developed which take into accountthe intrinsic open system aspect of the problem as well as details about atomicrelative positions and temporal (spectral) features of the pulses. In thispaper, we investigate the generation of nonclassical correlations between twoatoms in free space interacting with a quantized pulse containing just onesingle photon. For this purpose, we develop a general theoretical approachwhich allows us to find the equations of motion for single- and two-body atomicoperators from which we obtained the system density operator. We show that onesingle photon is capable of promoting substantial entanglement between twoinitially ground state atoms, and we analyze the dependence of thesecorrelations on atomic relative positions (vacuum effects) and spectralfeatures of the single photon pulse.

Entanglement in atomic systems interacting with single-photon pulses in free space